ATA5811 datasheet(13/90 Pages) ATMEL

13 / 90 page

ATA5811/ATA5812 [Preliminary]

4689B–RKE–04/04

Figure 9 shows narrow band blocking and Figure 10 wide band blocking characteristics.

T h e me as ur e m e n ts we r e do ne wi th a us ef ul s i gn al of 43 3.9 2 MH z/ FSK/

20 kBaud/

±16 kHz/Manchester with a level of -106 dBm + 3 dB = -103 dBm which is

3 dB above the sensitivity level. The figures show how much a continuous wave signal

can be larger than -103 dBm until the BER is higher than 10-3. The measurements were

done at the 50

Ω input according to Figure 7 on page 10. At 1 MHz, for example, the

blocker can be 56 dB higher than -103 dBm which is -103 dBm + 56 dB = -47 dBm.

These values, together with the good intermodulation performance, avoid the need for a

SAW filter in the key fob application.

Figure 9. Narrow Band 3 dB Blocking Characteristic at 433.92 MHz

Figure 10. Wide Band 3 dB Blocking Characteristic at 433.92 MHz

Figure 11 on page 14 shows the blocking measurement close to the received frequency

to illustrate the selectivity and image rejection. This measurement was done 6 dB above

the sensitivity level with a useful signal of 433.92 MHz/FSK/20kBaud/±16 kHz/

Manchester with a level of -106 dBm + 6 dB = -100 dBm. The figure shows to which

extent a continuous wave signal can surpass -100 dBm until the BER is higher than

10-3. For example, at 1 MHz the blocker can than be 59 dB higher than -100 dBm which

is -100 dBm + 59 dB = -41 dBm.

-10,0

0,0

10,0

20,0

30,0

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50,0

60,0

70,0

-5,0

-4,0

-3,0

-2,0

-1,0

0,0

1,0

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4,0

5,0

Distance of Interfering to Receiving Signal [MHz]

-10,0

0,0

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50,0

60,0

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-50,0

-40,0

-30,0

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-10,0

0,0

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Distance of Interfering to Receiving Signal [MHz]

ATA5811 Datasheet(PDF) 13 Page - ATMEL Corporation

ATA5811 Datasheet(HTML) 13 Page - ATMEL Corporation

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